Messages in this thread | | | Date | Wed, 09 Dec 2009 19:00:44 -0600 | From | Robert Hancock <> | Subject | Re: Useless thermal acpi driver ? |
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On 12/09/2009 04:26 PM, J.A. Magallón wrote: > Hi all... > > I have a couple boxes where the thermal acpi driver gives this: > > bran:~> sensors > acpitz-virtual-0 > Adapter: Virtual device > temp1: +26.8°C (crit = +100.0°C) > > bran:~> acpi -t > No support for device type: battery > Thermal 1: ok, 27.0 degrees C > > It stays _always_ the same, there is no difference if I run some number > crunchin, or even if one of them is overclocked from 2.8 to 3.0 GHz.
There are systems where an ACPI thermal zone exists but isn't really hooked up to anything and just reports some dummy temperature value. My old system reported 40 degrees C no matter what. (I think it's something like the thermal zone support is part of the standard ACPI DSDT template the mobo maker got from the BIOS developer and they effectively disabled it by putting in the dummy temperature.)
> They are 1U supermicro boxes, ventilation is good, but I don't trust this > measures... > It looks like the system is using some kind of 'generic' acpi TZ driver, > but as I'm used to good-ol' sensors modules, I don't know where to look. > > Previously I used the w83627hf module from sensors.
I'm assuming the kernel is preventing that module from loading since the ACPI DSDT has operation regions that refer to the device registers. There's no guarantee that this means the BIOS actually accesses the device, or if it does, that there's a way to get it to report what it sees other than to itself. If the BIOS doesn't actually access the device then you can use the acpi_enforce_resources=lax to allow it. The problem is this might be totally unsafe and the kernel has no way to tell if it is or isn't. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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